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The CICA Windows Explosion!
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The CICA Windows Explosion! - Disc 2.iso
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eckelt01.zip
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16
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WRAPPED.CPP
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C/C++ Source or Header
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1995-02-23
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3KB
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99 lines
// File from page 704 in "Thinking in C++" by Bruce Eckel
//////////////////////////////////////////////////
// From the compressed package ECKELT01.ZIP 2/21/95
// Copyright (c) Bruce Eckel, 1995
// Source code file from the book "Thinking in C++",
// Prentice Hall, 1995, ISBN: 0-13-917709-4
// All rights reserved EXCEPT as allowed by the following
// statements: You may freely use this file for your own
// work, including modifications and distribution in
// executable form only. You may copy and distribute this
// file, as long as it is only distributed in the complete
// (compressed) package with the other files from this
// book and you do not remove this copyright and notice.
// You may not distribute modified versions of the source
// code in this package. This package may be freely placed
// on bulletin boards, internet nodes, shareware disks and
// product vendor disks. You may not use this file in
// printed media without the express permission of the
// author. Bruce Eckel makes no
// representation about the suitability of this software
// for any purpose. It is provided "as is" without express
// or implied warranty of any kind. The entire risk as to
// the quality and performance of the software is with
// you. Should the software prove defective, you assume
// the cost of all necessary servicing, repair, or
// correction.
// If you think you've found an error, please
// email all modified files with loudly commented changes
// to: eckel@aol.com (please use the same
// address for non-code errors found in the book).
//////////////////////////////////////////////////
//: WRAPPED.CPP -- Safe, atomic pointers
#include <fstream.h>
#include <stdlib.h>
ofstream out("wrapped.out");
// Simplified. Yours may have other arguments.
template<class T, int sz = 1> class pwrap {
T* ptr;
public:
class rangeError {}; // Exception class
pwrap() {
ptr = new T[sz];
out << "pwrap constructor" << endl;
}
~pwrap() {
delete []ptr;
out << "pwrap destructor" << endl;
}
T& operator[](int i) throw(rangeError) {
if(i >= 0 && i < sz) return ptr[i];
throw rangeError();
}
};
class bonk {
public:
bonk() { out << "bonk()" << endl; }
~bonk() { out << "~bonk()" << endl; }
void g() {}
};
class og {
public:
void* operator new[](size_t sz) {
out << "allocating an og" << endl;
throw int(47);
return 0;
}
void operator delete[](void* p) {
out << "deallocating an og" << endl;
::delete p;
}
};
class useResources {
pwrap<bonk, 3> Bonk;
pwrap<og> Og;
public:
useResources() : Bonk(), Og() {
out << "useResources()" << endl;
}
~useResources() {
out << "~useResources()" << endl;
}
void f() { Bonk[1].g(); }
};
main() {
try {
useResources ur;
} catch(int) {
out << "inside handler" << endl;
} catch(...) {
out << "inside catch(...)" << endl;
}
}